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| 1 | 防治煤自燃的弹性水凝胶形成机理及特性研究显示文摘为了解决传统矿用无机凝胶脆性大、受压易破碎等问题,基于天然增稠剂与有机成胶剂的交联作用研制得到环保型弹性水凝胶.采用傅里叶红外光谱仪、旋转流变仪、程序升温试验等仪器和方法研究了弹性水凝胶的形成机理、流变规律、弹性抗破坏性能和阻化效果.试验结果表明:成胶剂与增稠剂反应生成高弹性的三维网络凝胶结构,当增稠剂、成胶剂、水的质量分数分别为0.3%,0.3%,99.4%时,制备得到弹性水凝胶材料;所得弹性水凝胶受压回弹后的形状记忆比达到90.5%,表现出优异的弹性变形能力,同时在切割破坏5 min后即可实现切口的重新交联与自愈合修复,保障了对煤体的长期覆盖润湿.弹性水凝胶具有长期锁水保湿特性,添加质量分数为5%时将煤的交叉点温度提高了25℃以上;利用弹性水凝胶覆盖火源时,较无机凝胶更快速地润湿燃煤,有助于高效控制并熄灭火源. | 史全林 秦波涛 | 2022 | 中国矿业大学学报2022，51，6： | 3 |
| 2 | Influence of backfilling rate on the stability of the'backfilling bodyimmediate roof'cooperative bearing structure显示文摘To reduce the cost of backfilling coal mining and utilize the underground space of coal mines,a new backfilling mining method with low backfilling rate called constructional backfilling coal mining(CBCM)is proposed.The 'backfilling body-immediate roof' cooperative bearing structure of CBCM is analyzed by establishing the model of the medium thick plate on an elastic foundation.The influence of the backfilling rate on the stability of overlying strata is analyzed by the numerical simulation experiment.The control effect of CBCM is verified by a physic similar simulation test.The economic benefit of CBCM is analyzed.The conclusions are:the deformation characteristics of the immediate roof and critical backfilling spacing in CBCM can be analyzed based on the Hu Haichang’s theory.Exerting the bearing capacity of the immediate roof is beneficial to the stability of the overlying strata.The CBCM has a good control effect on the overburden in Xinyang Mine when the backfilling rate is lower than 25%.The backfilling cost of per ton coal is 37.39 yuan/t when the backfilling rate is 13.7%,with a decrease rate of 56.63%than the full-filling.The research results can provide theoretical support for the application of CBCM in coal mining. | Xianjie Du Guorui Feng Min Zhang Zehua Wang Wenhao Liu | 2022 | International Journal of Mining Science and Technology2022，32，6： | 1 |
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